We find that if people manually sleep a mac running Mojave (10.14.5) from the Finder menu that mac is then nearly impossible to wake up. So, at least on lecterns, I am using this command to disable the sleep menu item –
defaults write /Library/Preferences/com.apple.PowerManagement.plist SystemPowerSettings -dict SleepDisabled -bool YES
For more details see:
https://derflounder.wordpress.com/2013/01/27/disabling-the-sleep-command-in-the-apple-menu/
On the Mac there are a number of ways to control the sleep timers. Some seem to work better than others. For Mojave (MacOS 10.14.x) I have switched to using the command peset.
peset -g shows a list of settings
peset -a allows you to change those settings
Example:
bash-3.2# pmset -a sleep 120 bash-3.2# pmset -a displaysleep 120 bash-3.2# pmset -a disksleep 120 bash-3.2# pmset -g
Additional details on this are available at:
https://eclecticlight.co/2017/01/20/power-management-in-detail-using-pmset/